Invertase activity in Streptococcus mutans and Streptococcus sanguis |
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Authors: | M M McCabe E E Smith R A Cowman |
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Affiliation: | Department of Biochemistry, University of Miami School of Medicine, Miami, Florida 33152, U.S.A.;Dental Research Unit, Veterans Administration Hospital, and Institute of Oral Biology, University of Miami, Miami, Florida 33152, U.S.A. |
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Abstract: | Toluene treatment of intact cells revealed invertase-like activity in Streptococcus mutans K1-R (cariogenic) and in Streptococcus sanguis 903–1600 (noncariogenic). The activity was identified as a β-d-fructofuranoside fructohydrolase (invertase; EC. 3.2.1.26) by its hydrolysis of sucrose and raffinose and its failure to act on melezitose and other glucoside derivatives. The invertase was induced by sucrose in Strep, sanguis but was a constituent in Strep. mutans. Amylomaltase, a transferase acting on maltosaccharide, was also detected in both organisms. |
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